Heater



June 14, 1938. D BOOTHBY 2,120,795

HEATER Filed March 3, 1937 Lil INVENTOR.

DONALD 1280077113) BY WM? F M A TTORNEYS.

Patented June 14, 1938 P. Q

UNITED STATES PATENT OFFICE nn'a'raa Donald D. Boothby, Chicago, Ill., assignorto Air Devices Corporation, Chicago, 111., a corporation of Delaware Application March 3, 1937, Serial No. 128,709

8 Claims. (Cl. 219-39) This invention relates to heaters and more stantial angle without the necessity of a large particularly to portable tan-type'electric heaters. clearance between the casing and base which One of the objects of the invention is to prowould increase the overall'helght of the heater. vld'e a portable heater which is angularly adjust- The casing I6 is formed at its rear end with a able to direct the heated air in any desired series of air inlet openings 20 and at its front direction. Preferably the heater includes an end with a circular air outlet opening 22 ot' encased fan and heating coil with the casing smaller diameter than the casing and which-is pivotally mounted on a flat base which is formed preferably covered by a grille 26. An annular with an opening into which one side of the cassh et metal shell r r n 26 is s r to he m ing may project. This arrangement permits a front of the casing around the outlet opening wide range of adjustment '0! the casing on the 22 and extends into the casingto a point spaced base without the necessity for a large clearance from the back thereof to leave an air passage. between the base and casing. Air circulates through the space between the Another object of the invention is to provide casing and shell 5 th a Series Of inlet an encased heater in which the casing is kept openings 28 formed in the front of the casing cool at all times. This may be accomplished by between the point of attachment oi. the shell 26 providing an annular shell secured around an and the periphery of the casing in a manner to outlet opening of the casing with a series of inlet be described later. openings between the shell and casing throiigh A second annular sheet metal shell or ring 36 which air circulates to cool the casing. The of much shorter axial extent than the shell 26 motor and heating element are mounted within is mounted coaxially with and adjacent the rear this shell, a second shell preferably being proend of the shell 26 by means of a series of supvided around the motor to provide a passage p r in ra k ts 3 The shell 30 surroun n for cooling air therearound and to shield it from is spaced from an electric motor II which is the heating means. rigidly carried by a mounting bracket 36 extend 25 Va ious other objects and advantages of the ing diametrically across the rear of the casing invention including novel means for lubricating a which drives a fall 3 arranged Within the the motor and for supporting the motor and she is behind the grille other desirable features will appear from the Air circulating through the casing is heated by following description of the accompanying means of an electric heating coil ll mounted 30 drawing, in which: in the annular space between the shells 26 and Figure l is a central vertical section with parts J. in the path of air flowing therebetween. As in elevation of a heater embodying the invensh wn, h c il ll i f rm r f a p r l y f tion, and separate lengths of resistance wire having their Figure 2 is a front view of the heat r with ends connected in series by rivets or the like 42 35 4 part of the casing broken away, extending through plates 46 of mica or other The illustrated heater includes a flat sheetsuitable ulat n at a which ar suppo t d metal base 4 supported on a plurality of rubber on brackets 46 carried by the shell 26. The ends pads r th like 6 an having an opening 3 t of the coil are connected in parallel with .the

40 through. A bracket l0 secured to the lower surmotor 3 to a line 43 adapted to be P ed int face of the base carries a pair of clamp members the usual-wall or light socket, a switch 50 being I! which are secured to each other and to the provided to control the motor and coil simultabracket III by a bolt l6. neously.

The clamp members l2 extend through the In order to lubricate the motor 34 a trough 52 hole 8 and through the bottom of a cylindrical is provided across the top thereof connected to 45 sheet metal casing It to engage a pivot rod ll the motor shaft bearings by ducts 54. Oil may ca y the casing at s ow pa and lying be supplied to the trough 62 through a trough substantially horizontal at a ri ht n le to the carried by the bracket 3 and terminating adcasing axis. The rod l8 and clamp members l2 jacent one of the air inlet openings 20. Oil

form a frictional pivot joint about which the poured into the trough 56 flows into the trough 50 casing may be tilted to raise or lower the delivery 62 and through the ducts 64 into the motor of heated air therefrom, the lower rear edge of shaft bearings to lubricate them simultaneously. the casing extending through the hole 6 in the When the motor is running air will be drawn base as the casing is tilted. This construction in through the openings 20 and heated by its pas- 5 enables the casing to be tilted through a subsage around the coil 40 and forced out through the front of the casing. The shell serves both to protect the motor from direct radiation of heat from the coil 40 and to form an annular passage around the motor through which cooling air may flow. Since operation of the fan produces a low pressure area at the rear of the casing, air will be drawn in from the front through the openings 28 to circulate through the space between the casing and the shell 2E- thereby keeping the outside of the casing cool.

If it is desired to adjust the air discharge vertically the casing it may be tilted about the pivot joint formed by the rod iii and clamps it, the friction serving to hold the casing in any adjusted position. Since the unit is light any desired horizontal adjustment may be made by shifting the entire heater bodily.

While one heater embodying the invention has been shown and described in detail it will be understood that many changes might be made therein as will be apparent to those skilled in the art. It is accordingly not intended to limit the scope of the invention to the exact construction illustrated nor otherwise than by the terms of the appended claims.

What is claimed is: 1

l. A heater comprising a fiat base, a casing mounted on said base, heating means and air circulating means in said casing, and means for pivotally mounting the casing on-said base for pivotal movement about a substantially horizontal axis, said base being formed with an opening into which one side of the casing projects when the casing is tilted.

2. A. heater comprising a flat base, a casing mounted on said base, heating means and air circulating means in said casing, a pivot rod extending substantially horizontally across the ca..-- ing, and clamp means carried by the base and engaging said rod to form a pivotal connection, said base being formed with an opening into which one side of the casing projects when it is pivoted about said rod.

3. A heater comprising a flat sheet-metal base, a cylindrical casing mounted on said base, heating means and air circulating means in the casing, and means for mounting said casing on the base for pivotal movement about a. substantially horizontal axis, said base having an opening therein through which one side of the casing projects when the casing is tilted.

4. A heater comprising a fiat sheet-metal base, a cylindrical casing mounted on said base, heating means and air circulating means in the easing, a pivot rod extending substantially horizontally across the casing at the lower part there- .of and at right angles to the casing axis, and

7 5. A heater comprising a hollow casing havaraaros ing an air inlet opening in its back and an air outlet opening in its front, an annular shell in the casing secured to the casing front around said air outlet opening with its rear edge spaced from the back of the casing, said casing having a second air inlet opening in its front between said shell and the casing periphery, a motor mounted centrally of said shell at the rear part thereof, a fan in said shell adjacent the front thereof and driven by said motor, a second annular shell around the motor and spaced therefrom to form a passage for air to cool the motor, and heating means in the annular space between said two shells.

6. A heater comprising a hollow casing having an air inlet opening in its back and an air outlet opening in its front, an annular shell in the casing'secured to the casing front around said air outlet opening with its rear edge spaced from the back. of the casing, said casing having a second air inlet opening in its front between said shell and the casing periphery, a mounting bracket secured diametrically across the back of the casing, a motor secured to said bracket centrally thereof and lying within the shell, a second annular shell secured to the first named shell and surrounding and spaced from the motor, insulating means secured to the first named shell at spaced points around the motor, and an. electric heating coil secured to said insulating means and lying in the annular space be tween the two shells.

7. A heater comprising a cylindrical sheet metal casing having an air inlet opening in its back and an air outlet opening of smaller diameter than the casing in its front, an annular sheet metal shell secured to the front of the casing around the outlet opening and terminating short of the back of the casing, the front of the casing being formed with a series of air inlet openings between the casing periphery and the point of attachment of said shell to provide for circulation of air between the shell and casing, a second annular sheet metal shell mounted concentrically with said first named shell adjacent the rear end thereof, a motor mounted in said second shell and spaced therefrom to provide a passage for cooling air, lubricant ducts connected to said motor, a lubricant trough for supplying lubricant to said ducts and extending adjacent the air inlet opening in the casing back, a fan in the front part of the first named shell drivably connected to the motor, and heating means in the annular space between the shells.

8. A heater comprising a cylindrical casing, a motor mounted centrally of the casing adjacent the rear thereof, a fan in the front part of 

